We report experimental results from collapsed regime operation of capacitive micromachined ultrasonic transducers (cMUTs) fabricated by a wafer bonding technique. The results show that a cMUT operating in the collapsed regime produces a maximal output pressure higher than a cMUT operating in the precollapse regime at 90 % of its collapse voltage, 1.79 kPa/V vs. 9.72 kPa/V at 2.3 MHz. In collaps...

This paper presents an adaptive dead-time control circuit for a maximum work frequency 20 MHz, voltage level 90 V GaN gate driver. The is set to prevent straight-through of the upper and lower power transistors bridge arm structure ensure reliability motor For drivers on market today, fixed or configurable widely used in more-than-10 MHz application scenarios. However, switching loss caused by ...

OBJECTIVES The shape of the flow-volume (F-V) curve is known to change to showing a prominent plateau as stenosis progresses in patients with tracheal stenosis. However, no study has evaluated changes in the F-V curve according to the degree of bronchial stenosis in patients with unilateral main bronchial stenosis. METHODS We performed an analysis of F-V curves in 29 patients with unilateral ...

BACKGROUND The success of soft-tissue augmentation is offset by the low survival rates of grafted fat tissue. Research shows that adipose-derived stem cells (ASCs) and platelet-rich plasma (PRP) are beneficial to tissue healing. OBJECTIVES To evaluate the long-term effects of different volume fractions of PRP combined with ASCs on fat graft. METHODS ASCs were isolated from human fat tissue,...

This paper tests a key theoretical prediction of public finance, that redistribution discourages the participation of productive individuals. Specifically, I use a longitudinal data set to test whether and to what extent the intensive redistribution practiced by Israeli kibbutzim encourages exit of more productive individuals and entry of less productive ones. The findings support the theoretic...